Construction

Black type

A low TCR resistance alloy plate, with plated connection bands is protectively coated and numerically marked with the

resistance value. This part has standard plated end connections and is suitable for wave or IR reflow soldering.

Green type

A low TCR resistance alloy plate is grooved to set the final resistance, the lower faces are solder plated for

connections, and it is protectively coated and numerically marked with the resistance value. This part is ONLY suitable

for IR reflow soldering.

Marking

For values which are integer numbers of milliohms, the marking is 4-character IEC62 code; e.g. “R002” for 2m

Ω,

“R010” for 10m

Ω. For values including fractions of a milliohm the marking is 3 or 4-character code using “M” to

indicate the decimal point, e.g. “M75” for 0.75m

Ω, “1M50” for 1.5mΩ.

Termination Details:

Material

Matt tin plated finish over a barrier layer

Solderability

95% min coverage (MIL-STD 202F / 208H, 235ºC 2 secs)

Performance Data

Maximum

°C)

∆R%

±1% + 0.5m

Ω (Black): ±1% (Green)

De-rating from rated power at 80

°C

See Graph

∆R%

±0.5% + 0.5m

Ω (Black): ±1% (Green)

∆R%

±1% + 0.5m

Ω (Black): ±1% (Green)

∆R%

±0.5% + 0.5m

Ω (Black): ±1% (Green)

∆R%

±0.5% + 0.5m

Ω (Black): ±1% (Green)

Power de-rating graph

General Note

Welwyn Components reserves the right to make changes in product specification without notice or liability.

All information is subject to Welwyn’s own test data and is considered accurate at time of print.

©Welwyn Components Limited

Welwyn Electronics Park, Bedlington, Northumberland, NE22 7AA, England. Tel: 01670 822181 Fax: 01670 829465 Web: www.welwyn-tt.com

100%

P

0%

50%

T°C

80

170

0

-55

A subsidiary of TT electronics plc

Sn Plated Finish

Sn Plated Finish

Green type

Black type